According to Raphael Patai and Gershom Scholem, the Aesch-Mezareph dates from the 16th or early 17th centuries. AeschMezareph is translated into "Purifying Fire".

The book of Aesch Mezareph begins by talking about the quabalistic sephiroths, and how each sepiroth corresponds to each attributed metal and color.

Surprisingly the nature of Kether is hidden, and it's metal is not revealed. We get impressions of a white brilliance and right bellow it in Chokmah we see how the metal "Lead" is attributed to it. Therefore we also get the impressions of the ancient alchemical procedure of turning led into gold, while simultaneously hinting to us that anything below kether can never be as holy and pure as kether itself.

Kether is surrounded by great obscurity, and it is also the metal from which all others get their origin.

The nature of kether is hidden just like the nature of the great god-head is said to be unknown to us.Lead is the metal attributed to Chokmah, Tin is attributed to Binah, Silver to chesed, gold is given to geburah, and Iron to tiphareth. We usually seek gold from Tiphareth only to find Iron emenating from it.

Netzach and hod are the two median places of the body so they are attributed to hermaphroditic brass. And also the two pillars of the Temple of Solomon (referring to these two Sephiroth) were made of brass.

We also get to explore the 7 foundations of gold, which can be synonymous to the 7 foundations of the human spirit, the 7 chakras, the 7 planets and influencing forces. Seven is a dear number in metaphysics and occult philosophy.

The metals correspond to the sephiroths as follows;Kether – The metallic root from which all metals have their originThe origin of all metals, and the unknown metal